Guild socialism is a political movement advocating workers' control of industry through the medium of trade-related guilds. It originated in the United Kingdom and was at its most influential in the first quarter of the 20th century. It was strongly associated with G. D. H. Cole.

Guild socialism was partly inspired by the guilds of craftsmen and other skilled workers which had existed in medieval England. In 1906, Arthur Penty published Restoration of the Gild System in which he opposed factory production and advocated a return to an earlier period of artisanal production organised through guilds. The following year, the journal The New Age became an advocate of guild socialism, although in the context of modern industry rather than the medieval setting favoured by Penty. In 1914, S. G. Hobson, a leading contributor to The New Age, published National Guilds: An Inquiry into the Wage System and the Way Out. In this work, guilds were presented as an alternative to state-control of industry or conventional trade union activity. Guilds, unlike the existing trade unions, would not confine their demands to matters of wages and conditions but would seek to obtain control of industry for the workers whom they represented. Ultimately, industrial guilds would serve as the organs through which industry would be organised in a future socialist society.

The theory of guild socialism was developed and popularised by G. D. H. Cole who formed the National Guilds League in 1915 and published several books on guild socialism, including Self-Government in Industry (1917) and Guild Socialism Restated (1920). A National Building Guild was established after World War I but collapsed in 1922.